Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"son thanh du snippets" » "ban thanh du snippets", "van thanh du snippets", "son thanh do snippets", "son thanh tu snippets", "son thanh de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("son thanh du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("son thanh du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( son thanh du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("son thanh du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.